/*
 * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

// The pair manager is used by the broad-phase to quickly add/remove/find pairs
// of overlapping proxies. It is based closely on code provided by Pierre Terdiman.
// http://www.codercorner.com/IncrementalSAP.txt

package org.box2dflash.collision {
	import org.box2dflash.common.*;

	public class Pair {
		public function setBuffered():void { 
			status |= e_pairBuffered; 
		}

		public function clearBuffered():void { 
			status &= ~e_pairBuffered; 
		}

		public function isBuffered():Boolean { 
			return (status & e_pairBuffered) == e_pairBuffered; 
		}

		public function setRemoved():void { 
			status |= e_pairRemoved; 
		}

		public function clearRemoved():void { 
			status &= ~e_pairRemoved; 
		}

		public function get isRemoved():Boolean { 
			return (status & e_pairRemoved) == e_pairRemoved; 
		}

		public function setFinal():void { 
			status |= e_pairFinal; 
		}

		public function get isFinal():Boolean { 
			return (status & e_pairFinal) == e_pairFinal; 
		}

		public var userData:* = null;
		public var proxyId1:uint;
		public var proxyId2:uint;
		public var next:uint;
		public var status:uint;
		// STATIC
		static public var _nullPair:uint = Settings.USHRT_MAX;
		static public var _nullProxy:uint = Settings.USHRT_MAX;
		static public var _tableCapacity:int = Settings._maxPairs;	
		// must be a power of two
		static public var _tableMask:int = _tableCapacity - 1;
		// enum
		static public var e_pairBuffered:uint = 0x0001;
		static public var e_pairRemoved:uint = 0x0002;
		static public var e_pairFinal:uint = 0x0004;
	}
}